[B! tcp] pero1ã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

pero1 id:pero1

tcpã«é–¢ã™ã‚‹pero1ã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (34)

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

${{author_name}}$
{{author_name}}{{created}}
{{ #comment }}{{ comment }}{{ /comment }}
- {{ label }}

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

SoftBankæºå¸¯ã¨net.ipv4.tcp_tw_recycle=1ã®ç›¸æ€§ãŒæ‚ªã„æœ¬å½“ã®ç†ç”± - Y-Ken Studio
photo by saschaaa Linuxã«ãŠã„ã¦TIME_WAITãªã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ã‚’æ¸›ã‚‰ã™æ‰‹æ³•ã¨ã—ã¦net.ipv4.tcp_tw_recycle=1ã«ã™ã‚‹ãƒ†ã‚¯ãƒ‹ãƒƒã‚¯ã¯æœ‰åã§ã™ã€‚ ã—ã‹ã—ç’°å¢ƒã«ã‚ˆã£ã¦ã¯SoftBankã«é™ã‚‰ãšå•é¡ŒãŒèµ·ãã‚‹ãŸã‚ã€åˆ©ç”¨ã«ã¯æ³¨æ„ãŒå¿…è¦ã§ã™ã€‚ ä¸€ä½“ã©ã®ã‚ˆã†ãªå•é¡ŒãŒèµ·ãã‚‹ã®ã‹ã€è©³ç´°ã«è§£èª¬ã•ã‚ŒãŸãƒ–ãƒã‚°ã‚’è¦‹ã¤ã‘ãŸã®ã§ç´¹ä»‹ã—ã¾ã™ã€‚ æ¤œè¨¼è¨˜äº‹ è¨˜äº‹1 kernel: TCP: time wait bucket table overflow ã®è§£æ¶ˆã¨TIME_WAITã‚’æ¸›ã‚‰ã™ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¨ã„ã†è¨˜äº‹ã§ã¯æ¬¡ã®è¨€åŠãŒã•ã‚Œã¦ã„ã¾ã™ã€‚ï¼ˆæŠœç²‹ï¼‰ ã‚µãƒ¼ãƒå´ã§ net.ipv4.tcp_tw_recycle ãŒæœ‰åŠ¹ã§ã€ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆå´ã§TCPã®ã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã‚ªãƒ—ã‚·ãƒ§ãƒ³ãŒæœ‰åŠ¹ï¼ˆLinuxã®å ´åˆnet.ipv4.tcp_timestamps = 1ï¼‰ã ã¨ã€NAT/LBã‚’è¶…ãˆãŸã¨ãã«SYNã‚’è½ã¨ã—
pero1 2014/06/22
network

linux

tcp

recycle
ãƒªãƒ³ã‚¯
SPDYã‚„QUICç™»å ´ã®èƒŒæ™¯ã€‚Webã®é€²åŒ–ãŒãƒ—ãƒãƒˆã‚³ãƒ«ã‚’å¤‰ãˆã¤ã¤ã‚ã‚‹ã€‚HTML5 Conference 2013
SPDYã‚„QUICç™»å ´ã®èƒŒæ™¯ã€‚Webã®é€²åŒ–ãŒãƒ—ãƒãƒˆã‚³ãƒ«ã‚’å¤‰ãˆã¤ã¤ã‚ã‚‹ã€‚HTML5 Conference 2013 Webã‚’ã‚ˆã‚Šé€Ÿãã—ã‚ˆã†ã¨ã€HTTPã‚ˆã‚Šã‚‚å„ªã‚ŒãŸãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦ææ¡ˆã•ã‚ŒãŸSPDYï¼ˆã‚¹ãƒ”ãƒ¼ãƒ‡ã‚£ï¼‰ã€‚ã—ã‹ã—ãã®SPDYã«ã‚ˆã£ã¦ã€ä¸‹ä½ãƒ¬ã‚¤ãƒ¤ã§ã‚ã‚‹TCPã®åˆ¶é™ãŒé¡•è‘—ã«è¦‹ãˆã‚‹ã‚ˆã†ã«ãªã£ã¦ã—ã¾ã„ã€ãã®ã“ã¨ã§TCPä»¥å¤–ã®ãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦QUICã‚’GoogleãŒææ¡ˆã—ã¦ã„ã¾ã™ã€‚ Webã®é€²åŒ–ã¯ã€ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆã®ãƒ—ãƒãƒˆã‚³ãƒ«ã«ã¾ã§å½±éŸ¿ã‚’ä¸Žãˆã‚ˆã†ã¨ã—ã¦ã„ã‚‹ã€ã¨ã„ã†éžå¸¸ã«èˆˆå‘³æ·±ã„è©±ãŒã€HTML5ã®ã‚³ãƒŸãƒ¥ãƒ‹ãƒ†ã‚£ã€Œhtml5jã€ä¸»å‚¬ã®ã‚¤ãƒ™ãƒ³ãƒˆã€ŒHTML Conference 2013ã€ã§è¡Œã‚ã‚ŒãŸå°æ¾å¥ä½œæ°ã®ã‚»ãƒƒã‚·ãƒ§ãƒ³ã€Œæœ€æ–°Webãƒ—ãƒãƒˆã‚³ãƒ«ã€å‚¾å‘ã¨å¯¾ç–ã€ã§è¡Œã‚ã‚Œã¾ã—ãŸã€‚ ãã®å†…å®¹ã‚’ãƒ€ã‚¤ã‚¸ã‚§ã‚¹ãƒˆã§ç´¹ä»‹ã—ã¾ã—ã‚‡ã†ã€‚ æœ€æ–°Webãƒ—ãƒãƒˆã‚³ãƒ«ã€å‚¾å‘ã¨å¯¾ç– å°æ¾ã§ã™ã€‚æ‰€å±žã¯NTTã‚³ãƒŸãƒ¥ãƒ‹ã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚ºã§HTML5ã®ç ”ç©¶
pero1 2013/12/04
web

spdy

network

tcp
ãƒªãƒ³ã‚¯
Working With TCP Sockets - A short, concise guide that teaches Rubyists the basics of socket programming, and then some!
You Don't Have to be a C Programmer to Understand Socket Programming A short, concise guide that teaches Rubyists the basics of socket programming, and then some! Do you know how your web server opens a socket, binds to an address, and accepts a connection? I did a lot of web programming before I had enough knowledge to dig in and figure this stuff out. I knew that other developers had a better gr
pero1 2013/11/28
network

tcp

book
ãƒªãƒ³ã‚¯
ãƒãƒƒãƒˆãƒ¯âˆ’ã‚¯ã®é€Ÿåº¦ã‚’èª¿ã¹ã‚‹æ–¹æ³•
"é€Ÿã•" ã®æ„å‘³ã¯ï¼Ÿ é…å»¶æ™‚é–“ã‚’æ¸¬ã‚‹ ãƒ‡ãƒ¼ã‚¿å¸¯åŸŸã‚’æ¸¬ã‚‹ è©¦é¨“ç”¨ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ä½œã‚‹ ä¾‹: wget ã§é€Ÿåº¦ã‚’æ¸¬å®š é€Ÿåº¦ä½Žä¸‹ã‚„å¤‰å‹•ã®åŽŸå› å›žç·šã‚’é«˜é€ŸåŒ–ã™ã¹ãã‹ï¼Ÿã©ã“ã¾ã§ï¼Ÿ "é€Ÿã•" ã®æ„å‘³ã¯ï¼Ÿ TCP/IP ã«ä½¿ã£ã¦ã„ã‚‹å›žç·šã®ã‚¹ãƒ”ãƒ¼ãƒ‰ã¨äº‘ã£ã¦ã‚‚å¤§ã¾ã‹ã«ã¯ "ãƒãƒ³ãƒ‰å¹…" ã¨ "ãƒ¬ã‚¤ãƒ†ãƒ³ã‚·ãƒ¼" ã®2ã¤ãŒã‚ã‚‹. ãƒ‡ãƒ¼ã‚¿å¸¯åŸŸ: ä¸€å®šæ™‚é–“ã‚ãŸã‚Šã«é€šä¿¡ã§ãã‚‹ãƒ‡ãƒ¼ã‚¿é‡. å€‹äººã®åˆ©ç”¨ã§ã¯ã“ã‚ŒãŒå®Ÿéš›ã®ä½¿ç”¨æ„Ÿã¨ä¿‚ã‚ã£ã¦ã„ã‚‹ã¨æ€ã†. ä»¥ä¸‹ã®ãƒãƒ³ãƒ‰å¹…, ãƒ¬ã‚¤ãƒ†ãƒ³ã‚·ãƒ¼ã®ä»–ã« ãƒ‘ã‚±ãƒƒãƒˆã‚µã‚¤ã‚º, å—ä¿¡çª“ã‚µã‚¤ã‚º,ã‚¨ãƒ©ãƒ¼ã«ä¾ã‚‹å†è»¢é€ãªã©ã®æ§˜ã€…ãªè¦å› ã«å½±éŸ¿ã•ã‚Œã‚‹. ãƒãƒ³ãƒ‰å¹…(band width): ä¸€å®šæ™‚é–“ã«é€šéŽã§ãã‚‹ãƒ‡ãƒ¼ã‚¿é‡. ãƒ‡ãƒ¼ã‚¿çµŒè·¯ã®å¤ªã•ã¨è€ƒãˆã‚‹ã¨è‰¯ã„. ç©¶æ¥µçš„ã«ã¯æµã›ã‚‹ä¿¡å·ã®å‘¨æ³¢æ•°(å¸¯åŸŸå¹…)ã«ã‚ˆã‚‹. çµŒè·¯ãŒè¤‡æ•°ã®è¦ç´ ã‹ã‚‰ãªã‚‹ã¨ã, æœ€å°ã®ãƒãƒ³ãƒ‰å¹…ã®è¦ç´ ãŒåˆ¶é™ã®è¦å› ã¨ãªã‚‹. ä¾‹ï¼š ã»ã¼, 10BASE, 100BASE
pero1 2013/10/26
network

tcp

latency
ãƒªãƒ³ã‚¯
é«˜é€Ÿãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã§ã®ã‚µãƒ¼ãƒãƒ¼è² è·ã‚’å¤§ããè»½æ¸›ã™ã‚‹ p2
TCPã§ã¯ï¼Œé€ä¿¡ã™ã¹ããƒ¦ãƒ¼ã‚¶ãƒ¼ãƒ»ãƒ‡ãƒ¼ã‚¿ãŒå¤§ãã™ãŽã¦1ã¤ã®ãƒ‘ã‚±ãƒƒãƒˆã§ä¼é€ã§ããªã„å ´åˆï¼Œãã®ãƒ‡ãƒ¼ã‚¿ã‚’åˆ†å‰²ã—ã¦è¤‡æ•°ã®TCPãƒ‘ã‚±ãƒƒãƒˆã«ã™ã‚‹ã€‚ã“ã‚ŒãŒTCPã‚»ã‚°ãƒ¡ãƒ³ãƒˆåŒ–ã§ã‚ã‚‹ã€‚TCPãƒ¦ãƒ¼ã‚¶ãƒ¼ãƒ»ãƒ‡ãƒ¼ã‚¿ã®åˆ†å‰²å˜ä½ã¯ï¼Œæœ€å¤§ã‚»ã‚°ãƒ¡ãƒ³ãƒˆé•·ï¼ˆMSSï¼‰ã¨å‘¼ã°ã‚Œï¼Œãƒ‡ãƒ¼ã‚¿ãƒ»ãƒªãƒ³ã‚¯ã«ã‚ˆã£ã¦ç•°ãªã‚‹ã€‚ç†ç”±ã¯ï¼ŒMSSã®å¤§ãã•ãŒãƒ‡ãƒ¼ã‚¿ãƒ»ãƒªãƒ³ã‚¯ã”ã¨ã®æœ€å¤§è»¢é€å˜ä½ï¼ˆMTUï¼‰ã«ä¾å˜ã—ã¦ã„ã‚‹ã‹ã‚‰ã§ã‚ã‚‹ï¼ˆå›³7ï¼‰ã€‚ TCPã‚»ã‚°ãƒ¡ãƒ³ãƒˆåŒ–ã®ä¾‹ã¨ã—ã¦ï¼Œã‚¤ãƒ¼ã‚µãƒãƒƒãƒˆä¸Šã§é€ä¿¡ã™ã¹ãTCPãƒ¦ãƒ¼ã‚¶ãƒ¼ãƒ»ãƒ‡ãƒ¼ã‚¿ãŒ3000ãƒã‚¤ãƒˆã®å ´åˆã‚’ç¤ºã™ï¼ˆå›³8ï¼‰ã€‚åˆ†å‰²å¾Œã®ãƒ‘ã‚±ãƒƒãƒˆã®ãƒ¦ãƒ¼ã‚¶ãƒ¼ãƒ»ãƒ‡ãƒ¼ã‚¿ã¯MSSã®å€¤ä»¥ä¸‹ã§ãªã‘ã‚Œã°ãªã‚‰ãªã„ã€‚ ã‚¤ãƒ¼ã‚µãƒãƒƒãƒˆã®MTUã¯1500ãƒã‚¤ãƒˆãªã®ã§ï¼ŒIPãƒ˜ãƒƒãƒ€ãƒ¼ã¨TCPãƒ˜ãƒƒãƒ€ãƒ¼ã®åˆ†ã‚’é™¤ãã¨ï¼ŒTCPãƒ¦ãƒ¼ã‚¶ãƒ¼ãƒ»ãƒ‡ãƒ¼ã‚¿ãŒæ ¼ç´ã§ãã‚‹ã®ã¯1ãƒ‘ã‚±ãƒƒãƒˆå½“ãŸã‚Šæœ€å¤§1460ãƒã‚¤ãƒˆã¨ãªã‚‹ã€‚TCPã‚»ã‚°ãƒ¡ãƒ³ãƒˆåŒ–ã§ã¯ï¼ŒTCPãƒ¦ãƒ¼ã‚¶ãƒ¼ãƒ»ãƒ‡ãƒ¼ã‚¿ã®åˆ†å‰²ã¨ä½µã›ã¦ï¼ŒIPãƒ˜ãƒƒãƒ€ãƒ¼ï¼ŒT
pero1 2013/05/02
network

tcp
ãƒªãƒ³ã‚¯
Maximum Transmission Unit - Wikipedia
Maximum Transmission Unit (MTUï¼šæœ€å¤§é€ä¿¡å˜ä½)ã¯ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã«ãŠã„ã¦1å›žã®è»¢é€ï¼ˆ1ãƒ•ãƒ¬ãƒ¼ãƒ ï¼‰ã§é€ä¿¡ã§ãã‚‹ãƒ‡ãƒ¼ã‚¿ã®æœ€å¤§å€¤ã‚’ç¤ºã™ä¼é€å˜ä½ã®ã“ã¨ã€‚ MTUã®å€¤ã¯åˆ©ç”¨ã•ã‚Œã‚‹é€šä¿¡ãƒ¡ãƒ‡ã‚£ã‚¢ã‚„ã‚«ãƒ—ã‚»ãƒ«åŒ–ã®æœ‰ç„¡ãªã©ã«ã‚ˆã£ã¦å¤‰ã‚ã‚‹ã€‚ãŸã¨ãˆã°ã‚¤ãƒ¼ã‚µãƒãƒƒãƒˆã§ã¯æœ€å¤§1,500ãƒã‚¤ãƒˆï¼ˆã‚ªã‚¯ãƒ†ãƒƒãƒˆï¼‰ãŒIPé€šä¿¡ã«åˆ©ç”¨ã§ãã‚‹ã€‚PPPoEã‚’ä½¿ã†ã¨ã‚«ãƒ—ã‚»ãƒ«åŒ–ã®ãŸã‚ã«8ãƒã‚¤ãƒˆã‚’ä½¿ã†ãŸã‚ã€1,492ãƒã‚¤ãƒˆã¨ãªã‚‹ã€‚WANã§ã¯ã•ã‚‰ã«åˆ¥ã®åˆ¶ç´„ãŒå…¥ã‚‹å ´åˆã‚‚ã‚ã‚Šã€ãŸã¨ãˆã°NTTæ±æ—¥æœ¬ãŠã‚ˆã³NTTè¥¿æ—¥æœ¬ãŒæä¾›ã™ã‚‹ãƒ•ãƒ¬ãƒƒãƒ„ã‚·ãƒªãƒ¼ã‚ºã®IPç¶²ã¯1,454ãƒã‚¤ãƒˆã¨ãªã£ã¦ã„ã‚‹[1]ã€‚ MTUã‚’è¶…ãˆãŸå ´åˆã€æ–ç‰‡åŒ–ï¼ˆãƒ•ãƒ©ã‚°ãƒ¡ãƒ³ãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ï¼‰ã—ã¦é€šä¿¡ã‚’è¡Œã†ã€‚ ãƒ‘ã‚±ãƒƒãƒˆé€šä¿¡ã‚’ç”¨ã„ã¦ä¸€å®šã‚µã‚¤ã‚ºã®ãƒ‡ãƒ¼ã‚¿ã‚’é€å—ä¿¡ã™ã‚‹å ´åˆã€ãƒ‘ã‚±ãƒƒãƒˆé•·ã®æ±ºå®šãŒé€šä¿¡ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã«å½±éŸ¿ã™ã‚‹ã€‚ é€šä¿¡ä¸ã«ãƒ‡ãƒ¼ã‚¿ãŒç ´æã—ãŸå ´åˆã€æ¤œå‡ºãŠã‚ˆã³å†é€ã¯ãƒ‘ã‚±ãƒƒãƒˆå˜ä½ã§è¡Œãª
pero1 2013/04/23
tcp

mss

mtu
ãƒªãƒ³ã‚¯
ã‚¨ãƒ³ãƒ‰ãƒ»ãƒ„ãƒ¼ãƒ»ã‚¨ãƒ³ãƒ‰ã®MTUã‚µã‚¤ã‚ºã«æ³¨æ„ï¼Œãƒ•ãƒ©ã‚°ãƒ¡ãƒ³ãƒˆå‡¦ç†ã¯æ€§èƒ½åŠ£åŒ–ã‚’æ‹›ã
WANã‚’ã¾ãŸã„ã§æ‹ ç‚¹é–“ã‚’æŽ¥ç¶šã—ã¦ã„ã‚‹å ´åˆï¼Œãƒ‘ã‚±ãƒƒãƒˆã®ãƒ•ãƒ©ã‚°ãƒ¡ãƒ³ãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ãŒåŽŸå› ã§ãƒˆãƒ©ãƒ–ãƒ«ã«é™¥ã‚‹ã“ã¨ãŒã‚ã‚‹ã€‚é€šä¿¡çµŒè·¯ä¸Šã§MTUï¼ˆmaximum transmission unitï¼‰ã‚µã‚¤ã‚ºãŒå°ã•ã„éƒ¨åˆ†ãŒã‚ã‚‹ã‚±ãƒ¼ã‚¹ã ã€‚å…·ä½“çš„ã«ã¯ï¼ŒåºƒåŸŸã‚¤ãƒ¼ã‚µãƒãƒƒãƒˆãƒ»ã‚µãƒ¼ãƒ“ã‚¹ã‚’åˆ©ç”¨ã—ã¦ã„ã‚‹å ´åˆã‚„ï¼Œæš—å·åŒ–æŠ€è¡“ã‚’ä½¿ã£ã¦VPNï¼ˆä»®æƒ³çš„ãªå°‚ç”¨ç·šï¼‰æŽ¥ç¶šã—ã¦ã„ã‚‹å ´åˆã§ã‚ã‚‹ã€‚ MTUã‚µã‚¤ã‚ºã¯ãƒ‡ãƒ¼ã‚¿ãƒ»ãƒ‘ã‚±ãƒƒãƒˆã‚’é€ä¿¡ã™ã‚‹éš›ã«è¨±å®¹ã•ã‚Œã‚‹æœ€å¤§ãƒ‘ã‚±ãƒƒãƒˆé•·ã§ï¼Œã‚¤ãƒ¼ã‚µãƒãƒƒãƒˆã§ã¯1518ãƒã‚¤ãƒˆã¨ã„ã†ã‚ˆã†ã«ç‰©ç†åª’ä½“ã«ã‚ˆã£ã¦ãã‚Œãžã‚Œå€¤ãŒæ±ºã¾ã£ã¦ã„ã‚‹ã€‚å•é¡Œã¯WANã«ãƒ‡ãƒ¼ã‚¿ã‚’é€å‡ºã™ã‚‹éš›ã«ã‚«ãƒ—ã‚»ãƒ«åŒ–ãªã©ã«ã‚ˆã£ã¦ãƒ‘ã‚±ãƒƒãƒˆé•·ãŒMTUã‚µã‚¤ã‚ºã‚’è¶…ãˆã¦ã—ã¾ã†ã‚±ãƒ¼ã‚¹ãŒã‚ã‚‹ã“ã¨ã ã€‚ãƒ‘ã‚±ãƒƒãƒˆé•·ãŒMTUã‚µã‚¤ã‚ºã‚’è¶…ãˆã¦ã„ã‚‹å ´åˆï¼Œãƒ«ãƒ¼ã‚¿ãƒ¼ãªã©ãŒè‡ªå‹•çš„ã«ãƒ‘ã‚±ãƒƒãƒˆã‚’ç´°åˆ†åŒ–ï¼ˆãƒ•ãƒ©ã‚°ãƒ¡ãƒ³ãƒˆï¼‰ã—ã¦é€ä¿¡ã™ã‚‹ã“ã¨ãŒã‚ã‚‹ã€‚ã“ã®å ´åˆï¼Œãƒ•ãƒ©ã‚°ãƒ¡ãƒ³ãƒˆå‡¦ç†ï¼Œå—ä¿¡å´ã§ã®å†çµ„ã¿ç«‹ã¦å‡¦ç†ãŒç™ºç”Ÿã—ï¼Œãƒ‘ãƒ•ã‚©ãƒ¼
pero1 2013/04/22
tcp

mss

network
ãƒªãƒ³ã‚¯
SEIL/SMF ã‚³ãƒŸãƒ¥ãƒ‹ãƒ†ã‚£ã‚µã‚¤ãƒˆ ãƒªãƒ‹ãƒ¥ãƒ¼ã‚¢ãƒ«
SEIL/SMF ã‚³ãƒŸãƒ¥ãƒ‹ãƒ†ã‚£ã‚µã‚¤ãƒˆã¯ãƒªãƒ‹ãƒ¥ãƒ¼ã‚¢ãƒ«ã—ã¾ã—ãŸã€‚ SEIL/SMF ã‚³ãƒŸãƒ¥ãƒ‹ãƒ†ã‚£ã‚µã‚¤ãƒˆã§æä¾›ã•ã‚Œã¦ã„ãŸã€ã‚µãƒãƒ¼ãƒˆãƒ•ã‚©ãƒ¼ãƒ©ãƒ ã€SEIL/x86 Fujiãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰ãƒšãƒ¼ã‚¸ã€ãƒ–ãƒã‚°ã¯ã€ä»¥ä¸‹ã®ãƒªãƒ³ã‚¯å…ˆã‚’ã”åˆ©ç”¨ãã ã•ã„ã€‚
pero1 2013/04/22
tcp

mss

network
ãƒªãƒ³ã‚¯
[B! linux][sysctl] kamipoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯
13.2. ã‚ã¾ã‚ŠçŸ¥ã‚‰ã‚Œã¦ã„ãªã„è¨å®šã¯ã„ã€å¤‰æ›´ã§ãã‚‹ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã¯ã¨ã¦ã‚‚ãŸãã•ã‚“ã‚ã‚Šã¾ã™ã€‚ ã“ã“ã§ã¯ãã‚Œã‚‰ã™ã¹ã¦ã‚’ãƒªã‚¹ãƒˆã—ãŸã„ã¨è€ƒãˆã¦ã„ã¾ã™ã€‚ ä¸€éƒ¨ã¯ Documentation/ip-sysctl.txt ã§ã‚‚èª¬æ˜Žã•ã‚Œã¦ã„ã¾ã™ã€‚ ã‚«ãƒ¼ãƒãƒ«ã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«æ™‚ã« 'Configure as router and not host' ã« 'Yes' ã¨ç”ãˆã¦ã„ã‚‹ã¨ã€ã“ã‚Œã‚‰ã®è¨å®šã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆãŒã€ ã“ã“ã«ç¤ºã™ã‚‚ã®ã¨ã¯ç•°ãªã£ã¦ã„ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ã€‚ Oskar Andreasson ã‚‚ã€ã“ã‚Œã‚‰ã®ãƒ•ãƒ©ã‚°ã«é–¢ã™ã‚‹ãƒšãƒ¼ã‚¸ã‚’å…¬é–‹ã—ã¦ã„ã¾ã™ã€‚ ã“ã“ã®ã‚‚ã®ã‚ˆã‚Šè‰¯ã„ã‚ˆã†ã«æ€ãˆã¾ã™ã®ã§ã€ å½¼ã®ãƒšãƒ¼ã‚¸ ã‚‚ãƒã‚§ãƒƒã‚¯ã—ã¦ã¿ã¦ãã ã•ã„ã€‚ è¨³æ³¨: ã“ã®éƒ¨åˆ†ã®è¨³å‡ºã«ã‚ãŸã£ã¦ã¯ã€ 2.2 ã‚«ãƒ¼ãƒãƒ«ä»˜å±žæ–‡æ›¸ proc.txt ã®ç¿»è¨³ ã‚’å‚è€ƒã«ã•ã›ã¦ã„ãŸã ãã¾ã—ãŸã€‚ 13.2.1. ipv4 å…¨ä½“ä¸€èˆ¬çš„ãªæ³¨æ„ã§ã™ãŒã€ã»ã¨ã‚“ã©ã®é€Ÿåº¦åˆ¶é™æ©Ÿèƒ½ã¯
pero1 2013/01/09
linux

network

tcp

performance
ãƒªãƒ³ã‚¯
é«˜è² è·ãƒžã‚·ãƒ³ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚° â€” ã‚ã‚Šãˆã‚‹ãˆã‚Šã‚
Recent entries Apache2.4ã®ãƒªãƒªãƒ¼ã‚¹äºˆå®šã¯æ¥å¹´(2011å¹´)åˆã‚(ã‚ãã¾ã§äºˆå®š) inoue 2010-12-23 Herokuã®ç™ºéŸ³ inoue 2010-12-20 é›‘èªŒè¨˜äº‹ã€Œã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ãƒ»ãƒ†ã‚¹ãƒˆPRESS Vol.9ã€ã®åŽŸç¨¿å…¬é–‹ inoue 2010-12-18 IPAæœªè¸ã®ãƒ‹ãƒ¥ãƒ¼ã‚¹ inoue 2010-12-15 åŠ´åŸºæ³•ã¨ãƒã‚ãƒ³ã‚²ãƒ¼ãƒ inoue 2010-12-06 ãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ inoue 2010-12-03 ASCII.techno logiesèªŒã«MapReduceã®è¨˜äº‹ã‚’æ›¸ãã¾ã—ãŸ inoue 2010-11-25 æŠ€è¡“è©•è«–ç¤¾ãƒ‘ãƒ¼ãƒ•ã‚§ã‚¯ãƒˆã‚·ãƒªãƒ¼ã‚ºçµ¶è³›ç™ºå£²ä¸ inoue 2010-11-24 é›‘èªŒé€£è¼‰ã€ŒEmacsã®ãƒˆãƒ©ãƒŽãƒžã‚ã€ã®åŽŸç¨¿(part8)å…¬é–‹ inoue 2010-11-22 RESTã®å½“æƒ‘ inoue 2010-11-22 ã€Œãƒ—
pero1 2013/01/09
linux

network

tcp
ãƒªãƒ³ã‚¯
kernelã‚’ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã—ã¦TIME_WAITå€¤ã‚’å¤‰æ›´ã™ã‚‹ - ãƒ¡ãƒ¢ã¨ã‹ãã‚“ãªæ„Ÿã˜ãªã‚„ã¤
kernelã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«ã¤ã„ã¦ ã¾ãå€‹äººçš„ãªæ‰€æ„Ÿãªã‚“ã§ã™ã‘ã©ã€‚ã€‚ 10å¹´å‰ãã‚‰ã„å‰ã€ã¨ã‚ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã§åŽŸå› ã®ãƒªãƒ³ã‚¯ãƒ€ã‚¦ãƒ³ãŒé »ç™ºã™ã‚‹ãƒˆãƒ©ãƒ–ãƒ«ãŒã‚ã‚Šã€ã¾ã£ãŸãåŽŸå› ãŒã‚ã‹ã‚‰ãªã‹ã£ãŸã®ã§ã™ãŒã€å½“æ™‚ã®å…ˆè¼©ãŒkernelã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’ã„ã˜ãã£ã¦ç›´ã—ãŸã“ã¨ãŒã‚ã‚Šã¾ã—ãŸ(ãªã‚“ã‹ãƒ‘ãƒƒãƒé€ã£ã¦ã¾ã—ãŸ)ã€‚ ç§ã¯ãã®é ƒãƒšãƒ¼ãƒšãƒ¼ã ã£ãŸã®ã§ã™ãŒã€ãªã«ã“ã®å¤‰æ…‹ã¨æ€ã„ã¤ã¤ã‚‚ã€ãã®æŠ€è¡“åŠ›ã«ã¨ã¦ã‚‚æ„Ÿå‹•ã—ã¾ã—ãŸã€‚ 10å¹´ãŸã£ãŸä»Šã¯ã ã„ã¶å®‰å®šã—ã¦ãŠã‚Škernelãƒ¬ãƒ™ãƒ«ã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¯ã‚ã¾ã‚Šå¿…è¦æ€§ã‚’æ„Ÿã˜ã¦ã„ã¾ã›ã‚“ãŒã€ã©ã†ã—ã¦ã‚‚ã£ã¦æ™‚ã¯ã“ã†ã‚„ã‚‹ã‚ˆã£ã¦æ„Ÿã˜ã®ãƒ¡ãƒ¢ã§ã™ã€‚ ã¾ãTIME_WAITå€¤ã‚’å¤‰ãˆã‚‹ãã‚‰ã„ãªã‚‰å¤§ã—ãŸã“ã¨ãªã„ã‚“ã§ã™ã‘ã©ãã€‚ã‚ã®ãƒªãƒ³ã‚¯ãƒ€ã‚¦ãƒ³ã£ã¦ã©ã†ã‚„ã£ã¦è§£æ±ºã—ãŸã®ã‹ãªã€‚10å¹´ãŸã£ãŸä»Šã§ã‚‚ã•ã£ã±ã‚Šã‚ã‹ã‚‰ã‚“ã€‚å¤‰æ…‹ã‚ ç’°å¢ƒç‰ OS: CentOS 5.8 (64bit) kernel: kernel-2.6.18-308
pero1 2012/12/30
linux

network

tcp
ãƒªãƒ³ã‚¯
Man page of TCP
Section: Linux Programmer's Manual (7) Updated: 2020-12-21 Index JM Home Page roff page åå‰ tcp - TCP ãƒ—ãƒãƒˆã‚³ãƒ« æ›¸å¼ #include <sys/socket.h> #include <netinet/in.h> #include <netinet/tcp.h> tcp_socket = socket(AF_INET, SOCK_STREAM, 0); èª¬æ˜Ž ã“ã‚Œã¯ RFCÂ 793, RFCÂ 1122, RFCÂ 2001 ã§å®šç¾©ã•ã‚Œã¦ã„ã‚‹ TCP ãƒ—ãƒãƒˆã‚³ãƒ«ã‚’ NewReno æ‹¡å¼µã¨ SACK æ‹¡å¼µã‚’å«ã‚ã¦å®Ÿè£…ã—ãŸã‚‚ã®ã§ã‚ã‚‹ã€‚ TCP ã¯ã€ ip(7) ä¸Šã®äºŒã¤ã®ã‚½ã‚±ãƒƒãƒˆé–“ã«ã€ä¿¡é ¼æ€§ã®é«˜ã„ã€ã‚¹ãƒˆãƒªãƒ¼ãƒ æŒ‡å‘ã®å…¨äºŒé‡ (full-duplex) é€šä¿¡ã‚’æä¾›ã™ã‚‹ã€‚ v4 ã¨ v6 ã®ä¸¡æ–¹ã®ãƒãƒ¼ã‚¸
pero1 2012/12/26
tcp
ãƒªãƒ³ã‚¯
kernel: TCP: time wait bucket table overflow ã®è§£æ¶ˆã¨TIME_WAITã‚’æ¸›ã‚‰ã™ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚° - æ°—ã¾ã¾ã«ã‚¤ãƒ³ãƒ•ãƒ©ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢
æ•´ç†ãŒã¦ã‚‰ã€‚ httpdãŒå‹•ã„ã¦ã„ã‚‹ã‚ã‚‹ãƒ›ã‚¹ãƒˆä¸Šã§ã€ /var/log/messages ã«ä»¥ä¸‹ã®ã‚ˆã†ãªãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ãŒå‡ºã¦ã„ãŸã€‚ kernel: TCP: time wait bucket table overflow kernel: printk: 50078 messages suppressed. "netstat -tna |grep TIME_WAIT"ã™ã‚‹ã¨ã€10ä¸‡ä»¥ä¸Šã®æ•°ã§TIME_WAITãŒå‡ºã¦ã„ã‚‹ã€‚ã“ã‚Œã‚’è§£æ¶ˆã™ã‚‹ã¾ã§ã®æµã‚Œã€‚ ãã‚‚ãã‚‚ã“ã®å€¤ã¯ã€ã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã® net.ipv4.tcp_max_tw_buckets ã§è¨å®šã•ã‚Œã¦ã„ã‚‹ã€‚ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã¯16384ã€‚ ï¼ˆâ†‘ã®é€šã‚Šã€ã‚¨ãƒ©ãƒ¼ãŒå‡ºãŸç’°å¢ƒã§ã¯æ—¢ã«ã‹ãªã‚Šå¤§ããªå€¤ãŒè¨å®šã•ã‚Œã¦ã„ãŸã®ã ãŒã€‚ï¼‰ /proc/sys/net/ipv4/tcp_max_tw_buckets ã‚·ã‚¹ãƒ†ãƒ ãŒåŒæ™‚ã«ä¿æŒã™ã‚‹ time-wait ã‚½ã‚±ãƒƒãƒˆã®æœ€å¤§
pero1 2012/12/26
linux

network

tcp

time_wait
ãƒªãƒ³ã‚¯
TIME_WAITã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¨kernelãƒªãƒ“ãƒ«ãƒ‰ for CentOS 6.0 - é€†è¥²ã®Webã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢
ä¹…ã—ã¶ã‚Šã«SRPMã‹ã‚‰kernelãƒªãƒ“ãƒ«ãƒ‰ã—ã¦ã¿ãŸã®ã§ã€ éŽåŽ»ã‚’æŒ¯ã‚Šè¿”ã‚Šã¤ã¤æ‰‹é †ã‚’ãƒ¡ãƒ¢ã€‚ ã‚½ãƒ¼ã‚·ãƒ£ãƒ«ã‚²ãƒ¼ãƒ ã‚„å¤–éƒ¨ã®APIã‚’ä½¿ç”¨ã™ã‚‹ã‚µãƒ¼ãƒ“ã‚¹ãªã©ã«ã‚ã‚ŠãŒã¡ãªã‚“ã§ã™ãŒã€ Webã‚µãƒ¼ãƒã¯ã€å—ã‘ã‚‹HTTPãƒªã‚¯ã‚¨ã‚¹ãƒˆãŒå¤šããªã‚‹ã¨ã€ å¤–éƒ¨ã®Webã‚µãƒ¼ãƒã«HTTPãƒªã‚¯ã‚¨ã‚¹ãƒˆã‚’é€ã‚‹å‡¦ç†ã‚‚å¤šããªã£ãŸã‚Šã—ã¾ã™ã€‚ ãã®å ´åˆã«å•é¡Œã¨ãªã‚‹ã®ãŒã€tcpã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ã§ã™ã€‚ TIME_WAITçŠ¶æ…‹ã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ãŒå¤šããªã‚‹ã¨ã€ æŽ¥ç¶šã§ãã‚‹æ•°ã¯ä¸Šé™ãŒã‚ã‚‹ã®ã§ã€æŽ¥ç¶šã§ããŸã‚Šã§ããªã‹ã£ãŸã‚Šä¸å®‰å®šãªçŠ¶æ…‹ã«ãªã‚Šã¾ã™ã€‚ ãã†ãªã‚‹ã¨ã€ã¾ã‚æ‹…å½“è€…ã¯ã‹ãªã‚Šãƒ†ãƒ³ãƒ‘ã£ã¦ã¾ã™ãã€‚ ã§ã‚‚è² è·çš„ã«ã¯ã‚µãƒ¼ãƒã¯ãƒ†ãƒ³ãƒ‘ã£ã¦ãªã‹ã£ãŸã‚Šã—ã¾ã™ã€‚ TIME_WAITå¤šç™ºå¯¾ç–ã¯ã–ã£ãã‚Š ã‚µãƒ¼ãƒå¢—å¼· ç·Šæ€¥å¯¾å¿œã¨ã„ã†ã“ã¨ã§ã€ã‚ãã¾ã§ä¸€æ™‚çš„ãªå¯¾å¿œã€‚å¯Œè±ªãªã‚‰ã“ã‚Œã§ã‚ˆã—ã€‚ ä½¿ç”¨ã§ãã‚‹TCPãƒãƒ¼ãƒˆç•ªå·ã‚’å¢—ã‚„ã—ãŸ å¢—åŠ é‡ãŒä¸Šå›žã‚‹å ´åˆã¯ã€ç„¼ã‘çŸ³ã«æ°´ã€‚ tcp_tw_recycl
pero1 2012/12/26
linux

network

tcp

time_wait
ãƒªãƒ³ã‚¯
Linux SYNãƒ‘ã‚±ãƒƒãƒˆå–ã‚Šã“ã¼ã— - LowPriority
Linuxã§è² è·ã‚‚å•é¡Œã«ãªã‚‹ã»ã©é«˜ããªãlistenåŠã³synã®backlogã‚‚æº¢ã‚Œã¦ãªã„ã®ã« ç‰¹å®šã®ãƒ›ã‚¹ãƒˆã‹ã‚‰ã®ã¿SYNã‚’å¸ã„è¾¼ã‚“ã§SYN-ACKã‚’è¿”ã•ãªã„äº‹ãŒã‚ã‚‹å ´åˆãŒã‚ã£ãŸã€‚ å¿…ãšå¸ã„è¾¼ã‚€ã¨ã„ã†ã‚ã‘ã§ã¯ãªãã€ä¸€ç™ºã§é€šã‚‹å ´åˆã¨æ•°å›žå†é€å—ã‘ã¦ã‹ã‚‰å‡¦ç†ã™ã‚‹ã®ã‚‚ ã‚ã£ãŸã‚Šã—ã¦è¬Žãªæ„Ÿã˜ã€‚tcpdumpã§è¦‹ã¦ã‚‚ãƒ‘ã‚±ãƒƒãƒˆå˜ä½ã®ä¸æ•´åˆã¯ç‰¹ã«è¦‹ã‚ãŸã‚‰ãªã„ã€‚ å—ã‘ä»˜ã‘ã¦ã„ã‚‹ç’°å¢ƒã§å¤‰æ›´ã•ã‚Œã¦ã„ãŸTCPãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã¯ä»¥ä¸‹ã§ã€syncookiesä»¥å¤–ã¯ IN/OUTã©ã®éƒ¨åˆ†ã®å‡¦ç†ã«é–¢ã‚ã‚‹ã®ã‹Documentèªã‚“ã§ã‚‚è‰¯ãè§£ã‚‰ãªã„ã®ã§ã€ãã‚Œãžã‚Œã« ã¤ã„ã¦å‚ç…§ç®‡æ‰€ã‚’èª¿ã¹ã¦ã¿ãŸã€‚(PATHã¯KERNELã®net/ä»¥ä¸‹) net.ipv4.tcp_tw_reuse (sysctl_tcp_tw_reuse) Outbound Connectionã ã‘å½±éŸ¿ ipv4/tcp_ipv4.c:tcp_v4_connect ip
pero1 2012/12/26
Linux

network

tcp
ãƒªãƒ³ã‚¯
[unix] Linux SYNãƒ‘ã‚±ãƒƒãƒˆå–ã‚Šã“ã¼ã— (2) 2007-05-21 - LowPriority
å‰å›žã®ç¶šãã€‚ ãƒ‘ã‚±ãƒƒãƒˆè‡ªä½“ã‚’é›¶ã•ãšã«å‡¦ç†ã«å…¥ã£ãŸå¾Œã«SYNã‚’è½ã¨ã™ã®ã¯ä»¥ä¸‹3ãƒ‘ã‚¿ãƒ¼ãƒ³ã€‚ syncookieç„¡åŠ¹æ™‚ã«synã®backlog(tcp_max_syn_backlog)ãŒæº¢ã‚Œã¦ã„ã‚‹ listenã®backlogãŒæº¢ã‚Œã¦ã„ã‚‹(3way-handshakeå®Œäº†å¾Œã®acceptå¾…ã¡æŽ¥ç¶š) net.ipv4.tcp_tw_recycleã®åˆ¶é™ã«æŠµè§¦ ã§ã€ä»Šå›žå•é¡Œã«ãªã£ã¦ã„ãŸã®ã¯æœ€å¾Œã®tcp_tw_recycleã¸ã®æŠµè§¦ã ã£ãŸã€‚ ç¾è±¡ã¨ã—ã¦ç™ºç”Ÿã—ã†ã‚‹ã®ã¯ã€ä»¥ä¸‹ã®æ¡ä»¶ã‚’ã™ã¹ã¦æº€ãŸã™å ´åˆ ã‚µãƒ¼ãƒå´ã§net.ipv4.tcp_tw_recycleãŒæœ‰åŠ¹ TCPã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’ä½¿ç”¨ åŒä¸€IPã‹ã‚‰ã®æŽ¥ç¶šã§ã‚»ãƒƒã‚·ãƒ§ãƒ³ã‚’è·¨ãã¨ã‚»ãƒƒãƒˆã•ã‚Œã‚‹TCPã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã®å€¤ãŒæˆ»ã‚‹å ´åˆãŒã‚ã‚‹ æœ€å¾Œã®æ¡ä»¶ãŒå¾®å¦™ã ãŒã€TCPã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã®å€¤ã¨ã—ã¦ã‚»ãƒƒãƒˆã•ã‚Œã‚‹å€¤ã¯èµ·å‹•æ™‚ã‚’ èµ·ç®—æ™‚ã«ã—ã¦ã„ãŸã‚Šã¨å®Ÿè£…ã«ã‚ˆã£ã¦åˆæœŸå€¤
pero1 2012/12/26
linux

network

tcp
ãƒªãƒ³ã‚¯
ã©ã•ã«ã£ã
2008å¹´4æœˆ21æ—¥(æœˆ) â– ç„¡é¡Œ _ ä»Šæœã®é›»è»Šã§ãŠã£ã•ã‚“ãŒèªã‚“ã§ãŸã‚¹ãƒãƒ¼ãƒ„æ–°èžã‹ã‚‰ã¡ã‚‡ã£ã¨è¦‹ãˆã¦ãŸè¦‹å‡ºã—ã€‚é ã®ãŠã‹ã—ã„äººãŒæ–°å¹¹ç·šã§å…¨è£¸ã«ãªã£ã¦ã‚¿ã‚¤ãƒ¼ãƒ›ã€‚æ˜¥ã ãªãã€‚ _ å‡ºç¤¾ã—ã¦ã‹ã‚‰ãƒ‹ãƒ¥ãƒ¼ã‚¹ã‚µã‚¤ãƒˆã‚’å·¡å›žã—ã¦ã€ãã‚ŒãŒ ãƒ•ã‚¡ãƒ¼ã‚¹ãƒˆã‚µãƒ¼ãƒã®ç¤¾é•·ã ã£ãŸã¨çŸ¥ã‚‹ã€‚ã‚ãã€‚ _ ã¡ã€ã¡ãŒã†ã‚ˆã£ã€æ˜¥ã ã‹ã‚‰é ã®ãŠã‹ã—ã„äººãŒæ¹§ã„ã¦ããŸã‚“ã˜ã‚ƒãªã„ã‚ˆã£ã€‚ã ã£ã¦ãƒ¬ãƒ³ã‚¿ãƒ«ã‚µãƒ¼ãƒä¼šç¤¾ã®ç¤¾é•·ã ã‚ˆï¼Ÿ é ãŒãŠã‹ã—ã„ãªã‚“ã¦ã“ã¨ã¯ãªã„ã‚ˆã€‚æœ€è¿‘ã®ãƒ‡ãƒ¼ã‚¿ã‚»ãƒ³ã‚¿ãƒ¼ã¯é›»åŠ›å•é¡Œã¨ã‹ç†±å•é¡Œã¨ã‹ã„ã‚ã„ã‚å¤§å¤‰ã ã‹ã‚‰ãã€ãã£ã¨é™½æ°—ãŒã‚ˆããªã£ã¦ã‚ã£ãŸã‹ããªã£ãŸã‹ã‚‰ç†±æš´èµ°ã‚’èµ·ã“ã—ã¦ã€ãã®å†·å´ã®ãŸã‚ã«å¤§äº‹ãªã¨ã“ã‚ã‚’æ”¾ç†±ã—ã¦ãŸã ã‘ãªã‚“ã ã‚ˆã£ã€‚ _ ã¦ã‹ã€ãƒ•ã‚¡ãƒ¼ã‚¹ãƒˆã‚µãƒ¼ãƒã£ã¦ã„ã¤ã®ã¾ã«ã‹ yahoo ã®ç³»åˆ—ã«ãªã£ã¦ãŸã®ã‹ã€‚æ˜”ã¯ã‚¯ãƒœã‚¿(ã‚‚ã¡ã‚ã‚“è¾²æ¥æ©Ÿæ¢°ã®ã‚¯ãƒœã‚¿ã®ã“ã¨ã )ã®åä¼šç¤¾ã ã£ãŸã‚ˆãã€ãŸã—ã‹ã€‚ 2008å¹´4æœˆ28æ—¥(æœˆ) â– ç„¡é¡Œ _ ãƒ¡ãƒ¼ãƒ«å±‹ã‚’å»ƒæ¥ã—
pero1 2012/12/26
linux

network

tcp
ãƒªãƒ³ã‚¯
FLINTERS Engineer's Blog
2024-08-07 ç ”ä¿®çµ‚äº†å¾Œãƒ–ãƒã‚° BNç ”ä¿®ã®ç· ã‚ã¨ã—ã¦æŒ¯ã‚Šè¿”ã‚Š #ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ #æ–°å’ #ç ”ä¿® 2024-07-31 ã€24å’ã€‘FLINTERSã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ç ”ä¿®ã‚’çµ‚ãˆã¦ ç ”ä¿® æ ªå¼ä¼šç¤¾FLINTERSã«æ–°å’ã§ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã¨ã—ã¦å…¥ç¤¾ã—ã€3ãƒ¶æœˆé–“ã®ç ”ä¿®ã‚’çµ‚ãˆãŸã®ã§ãã®æ¦‚è¦ã‚’ãŠä¼ãˆã—ã‚ˆã†ã¨æ€ã„ã¾ã™ã€‚ #24å’ #25å’ #ç ”ä¿® #æ–°å’ #æ–°å’ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ 2024-07-24 é›°å›²æ°—ã¨ç ”ä¿®å†…å®¹ï¼šFLINTERSã®æ–°å…¥ç¤¾å“¡ã®3ãƒ¶æœˆæŒ¯ã‚Šè¿”ã‚Š 2024å¹´åº¦BNç ”ä¿®ã¾ã¨ã‚ 2024-06-21 Webãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ãƒ—ãƒãƒ€ã‚¯ãƒˆç”¨ã«ãƒ†ã‚¹ãƒˆæˆ¦ç•¥ã‚’è€ƒãˆãŸè©± ãƒ–ãƒã‚°ç¥ã‚Šæ¢…é›¨ Webãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ãƒ—ãƒãƒ€ã‚¯ãƒˆç”¨ã«ãƒ†ã‚¹ãƒˆæˆ¦ç•¥ã‚’è€ƒãˆãŸè©± 2024-06-21 ä»ŠæœŸæŒ¯ã‚Šè¿”ã‚Š ãƒ–ãƒã‚°ç¥ã‚Šæ¢…é›¨ ä»ŠæœŸæŒ¯ã‚Šè¿”ã‚Š #ä»ŠæœŸã®æŒ¯ã‚Šè¿”ã‚Š 2024-06-21 ä»ŠæœŸã®æŒ¯ã‚Šè¿”ã‚Š AWS ãƒ–ãƒã‚°ç¥ã‚Šæ¢…é›¨ ä»ŠæœŸã®æŒ¯ã‚Šè¿”ã‚Š #AWS 2024-06-
pero1 2012/12/26
linux

network

tcp
ãƒªãƒ³ã‚¯
OSS Message Pedia -mid:30094-
TCP: Treason uncloaked! Peer dst_ip_address:dst_port/src_port shrinks window this_seq_pos:next_seq_pos. Repaired. dst_ip_address TCPãƒ‘ã‚±ãƒƒãƒˆå†é€å…ˆã®IPã‚¢ãƒ‰ãƒ¬ã‚¹ dst_port TCPãƒ‘ã‚±ãƒƒãƒˆå†é€å…ˆã®ãƒãƒ¼ãƒˆç•ªå· src_port å†é€ã®éš›ã«ä½¿ç”¨ã™ã‚‹ã€è‡ªãƒ›ã‚¹ãƒˆã®ãƒãƒ¼ãƒˆç•ªå· this_seq_pos é€ä¿¡æ¸ˆã¿ã§ã‚ã‚‹ãŒã€ç›¸æ‰‹ãƒ›ã‚¹ãƒˆã‹ã‚‰ack(ç¢ºèªå¿œç”)ãŒæœªã å¸°ã£ã¦ãã¦ã„ãªã„ãƒ‘ã‚±ãƒƒãƒˆã®å…ˆé ä½ç½® next_seq_pos é€ä¿¡æ¸ˆã¿ã§ã‚ã‚‹ãŒã€ç›¸æ‰‹ãƒ›ã‚¹ãƒˆã‹ã‚‰ackãŒæœªã å¸°ã£ã¦ãã¦ã„ãªã„ãƒ‘ã‚±ãƒƒãƒˆã®æœ€å¾Œå°¾ã®ä½ç½® TCPã®é€šä¿¡å‡¦ç†ã‚’è¡Œã£ã¦ã„ã‚‹ã¨ãã«ä»¥ä¸‹ã®å…¨ã¦ã®æ¡ä»¶ã‚’æº€ãŸã—ãŸå ´åˆã«æœ¬ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã¯å‡ºåŠ›ã•ã‚Œã‚‹ã€‚ å†é€ä¿¡ã—ãŸãƒ‘ã‚±ãƒƒãƒˆã«å¯¾ã—ã¦ã®ackãŒç„¡ã„ TCP windowã‚µã‚¤ã‚ºãŒ0
pero1 2012/12/25
network

linux

tcp
ãƒªãƒ³ã‚¯
Linuxã‚µãƒ¼ãƒä¸Šã®HTTPãƒ—ãƒã‚ã‚·ã‚µãƒ¼ãƒã§ã‚·ã‚¹ãƒ†ãƒ è² è·ãŒé«˜ããªã„ã«ã‚‚ã‹ã‹ã‚ã‚‰ãšå‡¦ç†ãŒé…ã„å ´åˆï¼šTechLaboï¼šSo-netãƒ–ãƒã‚°
ä»•äº‹ã§ã€Linuxã‚µãƒ¼ãƒä¸Šã§HTTPãƒ—ãƒã‚ã‚·ã‚µãƒ¼ãƒã¨ã—ã¦å‹•ä½œã™ã‚‹ã¨ã‚ã‚‹URLãƒ•ã‚£ãƒ«ã‚¿ãƒªãƒ³ã‚°ã‚½ãƒ•ãƒˆã‚’ä½¿ã£ã¦ã„ã‚‹ãƒ¦ãƒ¼ã‚¶ã‹ã‚‰ã€ã€ŒãŠæ˜¼é ƒã‹ã‚‰ãƒ—ãƒã‚ã‚·ã‚µãƒ¼ãƒçµŒç”±ã§ã®ã‚¢ã‚¯ã‚»ã‚¹ãŒéžå¸¸ã«é…ã„ã€ã¡ãªã¿ã«CPUä½¿ç”¨çŽ‡ã¨ãƒ¡ãƒ¢ãƒªä½¿ç”¨çŽ‡ã€ãƒ‡ã‚£ã‚¹ã‚¯I/Oã¯æ£å¸¸æ™‚ã¨å¤‰ã‚ã‚Šãªã„ã®ã«ãªãœï¼Ÿã€ã¨ã„ã†å•ã„åˆã‚ã›ãŒã‚ã‚Šå¯¾å‡¦ã—ãŸã¨ãã®ãƒ¡ãƒ¢ã€‚ ã‚·ã‚¹ãƒ†ãƒ ãƒªã‚½ãƒ¼ã‚¹ã®è² è·ãŒé«˜ããªãã€å‡¦ç†é…å»¶ãŒç™ºç”Ÿã—ã¦ã„ã‚‹å ´åˆã®ç–‘ã†ç‚¹ã¨ã—ã¦ã¯ã€ ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ãŒä¸è¶³ã—ã¦ã„ã‚‹ ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ï¼ˆãƒ—ãƒã‚ã‚·ã‚µãƒ¼ãƒï¼‰ã®æœ€å¤§åŒæ™‚æŽ¥ç¶šæ•°ä»¥ä¸Šã®ã‚¢ã‚¯ã‚»ã‚¹ã‚’å—ã‘ä»˜ã‘ã¦ã„ã‚‹ ã‚«ãƒ¼ãƒãƒ«ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ä¸è¶³ ã®3ã¤ãŒè€ƒãˆã‚‰ã‚Œã‚‹ã€‚ 1ï¼Žã®ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ä¸è¶³ã¯ãƒ—ãƒã‚ã‚·ã‚µãƒ¼ãƒã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãŒ1ã‚»ãƒƒã‚·ãƒ§ãƒ³1ã‚¹ãƒ¬ãƒƒãƒ‰ã§å‹•ä½œã™ã‚‹ã‚ˆã†ãªã‚‚ã®ï¼ˆãƒ¡ã‚¸ãƒ£ãƒ¼ãªã‚‚ã®ã§ã¯squidãªã©ï¼‰ãŒç™ºç”Ÿã—ã‚„ã™ã„ã€‚ ãƒã‚°ãƒ•ã‚¡ã‚¤ãƒ«ã«â€too many open filesâ€ã¨ã„ã†ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ãŒè¨˜éŒ²ã•ã‚Œã‚‹ã®ã§
pero1 2012/12/25
linux

network

tcp
ãƒªãƒ³ã‚¯
1 2 æ¬¡ã®ãƒšãƒ¼ã‚¸